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Hydrogenation and dehydrogenation behaviours of nanocrystalline Mg₂₀Ni_10-xCu_x (x=0-4) alloys prepared by melt spinning

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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY 2010年第5期35卷 2040-2047页

作者： Zhang, Yang-huan Li, Bao-wei Ren, Hui-ping Guo, Shi-hai Zhao, Dong-liang Wang, Xin-lin Cent Iron & Steel Res Inst Dept Funct Mat Res Beijing 100081 Peoples R China Inner Mongolia Univ Sci & Technol Sch Mat Baotou 014010 Peoples R China

In order to improve the hydriding and dehydriding kinetics of the Mg2Ni-type alloys, Ni in the alloy was partially substituted by element Cu, and the nanocrystalline Mg2Ni-type Mg20Ni10-xCux (x = 0, 1, 2, 3, 4) alloys were synthesized by melt-spinning technique The structures of the as-cast and spun alloys were studied by XRD, SEM and HRTEM The hydrogen absorption and desorption kinetics of the alloys were measured using an automatically controlled Sieverts apparatus The results show that the substitution of Cu for Ni does not change the major phase Mg2Ni The hydrogen absorption capacity of the alloys first increases and then decreases with rising Cu content, but the hydrogen desorption capacity of the alloys grows with increasing Cu content The melt spinning significantly improves the hydrogenation and dehydrogenation capacity and kinetics of the alloys (C) 2009 Professor T Nejat Veziroglu Published by Elsevier Ltd All rights reserved

关键词： Mg2Ni-type alloy Melt-spinning Substituting Ni with Cu Structure hydriding and dehydriding kinetics

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Treatment of mine water high in Fe and Mn by modified manganese sand

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Mining Science and technology 2010年第4期20卷 571-575页

作者： HE Xuwen YANG Huimin HE Yong School of Chemical and Environment Engineering China University of Mining&TechnologyBeijing 100083China

The iron and manganese absorption properties of several filter media were studied. Four plain filter media and six surface-modified media were examined. The surface modification was performed using potassium permanganate as a surface treatment. The surface-modified manganese sand was found to be most efficient at removing iron and manganese from water. The metal concentrations in filtered effluent were between 0.01 and 0.04 mg/L, which is far lower than the standard for recycle water. A concen-tration of 5% KMnO4 was found to be most effective as surface modifier. The surface of the manganese sand modified by 5% KMnO4 was examined and found to be covered with a dense membrane of some compound. The membrane had the advantages of uniform texture, large surface area and physical and chemical stability. It was effective at removing iron and manganese from mine water.

关键词： mine water with high Fe and Mn filtration manganese sand media KMnO4 solution surface-modified

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Active-fault-alarm based pre-restoration mechanism in MPLS-TP optical network

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The Journal of china Universities of Posts and Telecommunications 2010年第3期17卷 97-103页

作者： BAI Hui-feng, LU Yue-ming, JI Yue-feng Key Laboratory of Information Photonics and Optical Communications, Ministry of Education, Beijing University of Posts and Telecommunications, Beijing 100876, china [a] Key Laboratory of Information Photonics Optical Communications Ministry of Education Beijing University of Posts Telecommunications Beijing 100876 China

The newly developed multi-protocol label switching transport profile （MPLS-TP） fails to actively alarm the fault in advance when conducting restoration in network, or to avoid the false-alarm when equipped with the active-fault-alarm （AFA） to support carrier-grade reliability. In order to solve this problem, a new AFA based pre-restoration mechanism （AFABPRM） is proposed for MPLS-TP controlled optical network, along with the three levels quality-of-service （QoS） based shortest path first rerouting algorithm （TQ-SPF） in this article. The AFABPRM takes full advantage of the AFA technologies, and can solve the false-alarm problem. Analytical and experimental results suggest the better performances of the new mechanism when compared restoration mechanism with or without AFA function, and show that the AFABPRM can solve the false-alarm problem efficiently.

关键词： MPLS-TP restoration AFA

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Microstructure and hydrogen storage characteristics of melt-spun nanocrystalline Mg₂₀Ni_10-xCu_x (x=0-4) alloys

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MATERIALS CHEMISTRY AND PHYSICS 2010年第1期124卷 795-802页

The nanocrystalline Mg2Ni-type alloys with nominal compositions of Mg20Ni10-xCux (x = 0-4) are synthesized by melt-spinning technique. The microstructures of the as-cast and spun alloys are characterized by XRD, SEM and HRTEM. The hydrogen absorption and desorption kinetics of the alloys are measured using an automatically controlled Sieverts apparatus. The electrochemical performances are tested by an automatic galvanostatic system. The results show that all the as-spun alloys hold typical nanocrystalline structure. The substitution of Cu for Ni does not change the major phase Mg2Ni. The hydrogen absorption capacity of the alloys first increases and then decreases with rising Cu content, but the hydrogen desorption capacity of the alloys always grows with increasing Cu content. Furthermore, the substitution of Cu for Ni significantly improves the electrochemical hydrogen storage performances of the alloys, involving both the discharge capacity and the electrochemical cycle stability. (C) 2010 Elsevier B.V. All rights reserved.

关键词： Mg2Ni-type alloy Substituting Ni with Cu Melt spinning Hydrogen storage characteristic

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Integrating Load Balancing into Channelization Strategy in Publish/Subscribe

Integrating Load Balancing into Channelization Strategy in P...

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24th IEEE International Conference on Advanced Information Networking and Applications (AINA)

作者： Chen, Haibiao Jin, Beihong Qi, Fengliang Chinese Acad Sci Inst Software Beijing 100190 Peoples R China Grad Univ Chinese Acad Sci Beijing PT-100190 Peoples R China

ISBN: (纸本)9780769540184

In Pub/Sub systems, channel-based approaches to routing the subscriptions and events have many advantages such as fewer routing messages, lower costs for subscription management, etc. But a potential issue embedded in this kind of approach, i.e. loadings on different event brokers are apt to unbalancing, is ignored more or less. In this paper, we design a load balancing mechanism and integrate it into a channel-based approach in a Pub/Sub system. In particular, we define a balancing state in a Pub/Sub system, and then propose the balancing control initiation algorithm which decides not only whether to perform load balancing among event brokers but also whether to adjust the number of event brokers. Also we present the load scheduling algorithm which can achieve load balancing by channel splitting, merging and migration. We conduct the experiments by taking loads with different distributions as input to reveal the capability of dealing with changing loads. The experimental data prove that our mechanism can help balance the system loads efficiently and dynamically start or shut down event brokers when facing overloads or insufficient loads.

关键词： Pub/Sub channel-based routing load balancing

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BmToll9, an Arthropod conservative Toll, is likely involved in the local gut immune response in the silkworm, Bombyx mori

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developmentAL AND COMPARATIVE IMMUNOLOGY 2010年第2期34卷 93-96页

作者： Wu, Shan Zhang, Xiaofeng Chen, Xiaomei Cao, Pingsheng Beerntsen, Brenda T. Ling, Erjun Chinese Acad Sci Grad Sch Res Ctr Insect Sci Inst Plant Physiol & EcolShanghai Inst Biol Sci Shanghai 200032 Peoples R China Zhejiang Entry Exit Inspect & Quarantine Bur Hangzhou 310012 Zhejiang Peoples R China Univ Missouri Dept Vet Pathobiol Coll Vet Meterinary Med Columbia MO 65211 USA

The Toll family of transmembrane proteins mediates signaling during the innate immune response in most animals. Toll9 is widespread in insects and has a unique signature, QHR, in its Toll/interleukin-1 receptor (TIR) domain. The introns in the TIR region are highly conserved among insects, suggesting the antiquity of Toll9 genes. Toll9 of Bombyx mori (BmToll9) was analysed by quantitative real-time RT-PCR. BmToll9 is constitutively expressed in egg, larval and adult stages prior to microbial challenge. BmToll9 is strongly expressed in the different parts of the gut, but weakly expressed in haemocytes, trachea, fat body, malpighian tubule and epidermis, and scarcely expressed in the silk glands. The injection of sterilized 0.85% NaCl solution inhibited BmToll9 expression in most tissues especially during the early responses. Staphylococcus aureus had no or limited effect on the expression of BmToll9 in the silkworm gut and fat body. But in epidermis, trachea, malpighian tubules and haemocytes, the expression of BmToll9 was significantly increased after S. aureus challenge. Infection of Escherichia coli significantly increased the BmToll9 expression in different parts of the gut as well as in epidermis, malpighian tubule and haemocytes. At 48 h after feeding of the fungus, Beauveria bassiana, BmToll9 expression was significantly increased. tissues responses to the injected and ingested bacteria showed that BmToll9 is probably involved in the local gut immune response in the silkworm. (C) 2009 Elsevier Ltd. All rights reserved.

关键词： BmToll9 RT-qPCR Expression Bombyx mori Sequence conservation Arthropods

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Impairments in cognition and resting-state connectivity of the hippocampus in elderly subjects with type 2 diabetes

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NEUROSCIENCE LETTERS 2010年第1期473卷 5-10页

作者： Zhou, Hong Lu, Wanjun Shi, Yongmei Bai, Feng Chang, Jinghao Yuan, Yonggui Teng, Gaojun Zhang, Zhijun Southeast Univ Sch Clin Med Nanjing 210009 Peoples R China Southeast Univ Affiliated ZhongDa Hosp Dept Neuropsychiat Nanjing 210009 Peoples R China Nanjing Med Univ Nanjing Brain Hosp Affiliated Dept Psychiat Nanjing 210029 Peoples R China Southeast Univ Affiliated ZhongDa Hosp Dept Radiol Nanjing 210009 Peoples R China

Type 2 diabetes mellitus (T2DM) is associated with an increased risk of Alzheimer's disease, which involves hippocampus-mediated cognitive impairment. The present study investigated whether the resting-state functional connectivity of the hippocampus would be changed in patients with T2DM. A region of interest-based resting-state functional magnetic resonance imaging (fMRI) approach was applied to explore functional connectivity differences between 21 elderly patients with T2DM and 19 well-matched healthy controls, with all participants assessed by multi-dimensional neuropsychological tests. We found that T2DM patients performed significantly worse in the Auditory Verbal Learning Test (AVLT) (especially for Delayed Recall and Recognition) and Clock Drawing Test (CDT) when compared with the control group, and cognitive function was negatively related to BMI and HbA(1c). Importantly, the hippocampus showed reduced functional connectivity bilaterally to widespread regions, including fusiform gyrus, frontal gyrus, temporal gyrus, anterior cingulate gyrus, medial frontal gyrus, posterior cingulate gyrus, precuneus and inferior parietal lobule in T2DM patients compared to healthy controls. T2DM is associated with an impaired pattern of default network function, and the specific disconnection pattern identified may be involved in the neuropathophysiology of this disease. (C) 2010 Published by Elsevier Ireland Ltd.

关键词： Type 2 diabetes mellitus hippocampus Cognitive function Functional magnetic resonance imaging

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Novel insights into sludge dewaterability by fluorescence excitation-emission matrix combined with parallel factor analysis

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WATER research 2010年第3期44卷 797-806页

作者： Yu, Guany-Hui He, Pin-Jing Shao, Li-Ming Tongji Univ State Key Lab Pollut Control & Resources Reuse Key Lab Yangtze River Water Environm Coll Environm Sci & Engn Shanghai 200092 Peoples R China

Sludge dewatering is of major interest in sludge volume reduction and handling properties improvement. Here we report an approach of fluorescence excitation-emission matrix (EEM) combined with parallel factor (PARAFAC) analysis to elucidate the factors that influence sludge dewaterability. Sludge flocs from 11 full-scale wastewater treatment plants were collected to stratify into different extracellular polymeric substances (EPS) fractions and then to characterize their fluorescence EEMs. Both the normalized capillary suction time (CST) and specific resistance to filtration (SRF) were applied to determine sludge dewaterability. The results showed that fluorescence EEMs of tightly bound fractions were not affected by the wastewater sources. In contrast, fluorescence EEMs of loosely bound fractions were affected by the wastewater sources. All the fluorescence EEMs could be successfully decomposed into a six-component model by PARAFAC analysis. Both normalized CST and SRF were significantly correlated with component 1 [excitation/emission (Ex/Em) = (220, 275)/350] in the supernatant fraction, with components 5 [Ex/Em = (230, 280)/430] and 6 [Ex/Em = (250, 360)/460] in the slime and LB-EPS fraction. These results reveal that except for proteins-like substances (component 1), sludge dewaterability is also affected by humic acid-like and fulvic acid-like substances (components 5 and 6) in the slime and LB-EPS fractions. Furthermore, this paper presents a promising and facile approach (i.e., EEM-PARAFAC) for investigating sludge dewaterability. (c) 2009 Elsevier Ltd. All rights reserved.

关键词： Dewaterability Excitation-emission matrix Extracellular polymeric substances PARAFAC Sludge flocs Wastewater treatment plant

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Detection and quantitation of bluetongue virus serotypes by a TaqMan probe-based real-time RT-PCR and differentiation from epizootic hemorrhagic disease virus

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JOURNAL OF VIROLOGICAL METHODS 2010年第1-2期168卷 237-241页

作者： Yin, Hui-qiong Zhang, Hong Shi, Li-jun Yang, Shu Zhang, Gai-ping Wang, Sheng-qi Zhang, Jin-gang Acad Mil Med Sci Inst Transfus Med Viral Safety Lab Natl Ctr Biomed Anal Beijing 100850 Peoples R China Henan Key Lab Anim Immunol Zhengzhou 450002 Peoples R China Beijing Inst Radiat Med Beijing 100850 Peoples R China

Twenty-four serotypes of bluetongue virus (BTV) have been recognized world wide. Reliable and quantitative assays of virus universal detection are essential for fighting against BT. A real-time reverse transcription-polymerase chain reaction (RT-PCR) with a TaqMan fluorescence probe has been developed for detection of the NS1 gene of different BTV serotypes. In BHK-21 cells, in the assay detected BTV1-22 specifically, and had no cross-reactivity with the closely related epizootic hemorrhagic disease virus (EHDV) serotypes 1-5. The limit of sensitivity of the assay was 0.1 TCID50/ml for BTV-1 and 102 copies for the control R121/pGEM. Accurate quantitation can be achieved with samples containing between 10(2) and 10(6) copies. The coefficient of variation (CV) of intra-assay and inter-assay ranged from 2.17% to 5.60%. The developed real-time RT-PCR assay showed good coincident rate (99.2%) with duplex RT-PCR in 122 whole blood clinical samples from sheep. Therefore, the real-time RT-PCR can be a reliable method for detection of various serotypes of BTV. (C) 2010 Elsevier B.V. All rights reserved.

关键词： Bluetongue virus Serotypes Real-time RT-PCR TaqMan fluorescent probe

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Resistive Switching Properties of Au/ZrO₂/Ag Structure for Low-Voltage Nonvolatile Memory Applications

IEEE ELECTRON DEVICE LETTERS

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IEEE ELECTRON DEVICE LETTERS 2010年第2期31卷 117-119页

作者： Li, Yingtao Long, Shibing Zhang, Manhong Liu, Qi Shao, Lubing Zhang, Sen Wang, Yan Zuo, Qingyun Liu, Su Liu, Ming Chinese Acad Sci Inst Microelect Lab Nanofabricat & Novel Devices Integrated Techn Beijing 100029 Peoples R China Lanzhou Univ Sch Phys Sci & Technol Lanzhou 730000 Peoples R China

The reliable resistive switching properties of Au/ZrO2/Ag structure fabricated with full room temperature process are demonstrated in this letter. The tested devices show low operation voltages (< 1 V), high resistance ratio (about 10(4)), fast switching speed (50 ns), and reliable data retention (ten years extrapolation at both RT and 85 degrees C). Moreover, the benefits of high yield and multilevel storage possibility make them promising in the next generation nonvolatile memory applications.

关键词： Nonvolatile memory resistance random access memory (RRAM) resistive switching ZrO2

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